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Part 5. Trouble Shooting
- 50 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Turn off main power.
Check the electrical wiring diagram of Outdoor side.
Check the open or short of connecting wires between Indoor and Outdoor.
When the sensor circuit for Indoor temperature and connector are in bad connection or are
not engaged, Compressor/Outdoor fan is stopped.
• Check the related circuit of R02H(12.1K), R01H(1K), R04H(6.2K), R03H(1K), C01H(102),
C02H(102), Micom(pin No. ⑪, ⑫).
• Check the Indoor temperature sensor is disconnected or not (about 10K at 25°C).
Check the Relay(RY-PWR, RY-START) for driving Compressor.
• Check the voltage between brown and blue cable of terminal to connect the Outdoor
(About AC208/230).
• Check the related circuit of relay in Outdoor PCB Ass'y.
Check Point
Between Micom(No. 19) and
GND
DC 5V DC 0V
DC 12VDC 1V↓
Between IC01M(No. 10) and
GND
Comp. ON Comp. OFF
Check the Relay(RY-PWR, RY-CHARGE) for driving Compressor.
• Check the voltage between brown and blue cable of terminal to connect the Outdoor
(About AC208/230).
• Check the related circuit of relay in Outdoor PCB Ass'y.
Check Point
Between Micom(No. 11) and
GND
DC 5V DC 0V
DC 12VDC 1V↓
Between IC01M(No. 16) and
GND
Comp. ON Comp. OFF
36,42kBtu/h class
18,24,36kBtu/h class
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